Cluster centers equal to 0

[wfphyl]

Hello Mic92,

I was trying to run your code, however the results of clusters are sometimes has 0 centers.
When the cluster_num = 2, it is fine. However, when the cluster_num = 4, it has two 0 centroid.

time_series = [[1,2,3,4], [0,1,2,3], [0,1,2,3], [1,2,2,3],[2,2,2,2],[9,9,8,7],[2,2,1,1]]

cluster_num =4
clusters = _kshape(zscore(time_series), cluster_num)
clusters
(array([1, 1, 1, 1, 2, 2, 2]), array([[ 0. , 0. , 0. , 0. ],
[-1.2222319 , -0.35269008, 0.52140717, 1.05351481],
[-0.56324856, -1.1229572 , 0.83705112, 0.84915464],
[ 0. , 0. , 0. , 0. ]]))

[Mic92]

All your time series got assigned to the second and the third centroid. I just implemented the algorithm as it were described in the paper and the provided Matlab code. It is a property of the algorithm to leave non-assignable clusters empty. If you think this is a bug, please confirm this is a derivation from the original implementation.